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<!DOCTYPE html>
<!--
Copyright (c) 2014 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<link rel="import" href="/tracing/ui/base/ui.html">
<dom-module id="tr-ui-b-drag-handle">
<template>
<style>
:host {
-webkit-user-select: none;
box-sizing: border-box;
display: block;
}
:host(.horizontal-drag-handle) {
background-image: -webkit-gradient(linear,
0 0, 0 100%,
from(#E5E5E5),
to(#D1D1D1));
border-bottom: 1px solid #8e8e8e;
border-top: 1px solid white;
cursor: ns-resize;
flex: 0 0 auto;
height: 7px;
position: relative;
}
:host(.vertical-drag-handle) {
background-image: -webkit-gradient(linear,
0 0, 100% 0,
from(#E5E5E5),
to(#D1D1D1));
border-left: 1px solid white;
border-right: 1px solid #8e8e8e;
cursor: ew-resize;
flex: 0 0 auto;
position: relative;
width: 7px;
}
</style>
<div></div>
</template>
</dom-module>
<script>
'use strict';
Polymer({
is: 'tr-ui-b-drag-handle',
created() {
this.lastMousePos_ = 0;
this.onMouseMove_ = this.onMouseMove_.bind(this);
this.onMouseUp_ = this.onMouseUp_.bind(this);
this.addEventListener('mousedown', this.onMouseDown_);
this.target_ = undefined;
this.horizontal = true;
this.observer_ = new WebKitMutationObserver(
this.didTargetMutate_.bind(this));
this.targetSizesByModeKey_ = {};
this.currentDraggingSize_ = undefined;
},
get modeKey_() {
return this.target_.className === '' ? '.' : this.target_.className;
},
get target() {
return this.target_;
},
set target(target) {
this.observer_.disconnect();
this.target_ = target;
if (!this.target_) return;
this.observer_.observe(this.target_, {
attributes: true,
attributeFilter: ['class']
});
},
get horizontal() {
return this.horizontal_;
},
set horizontal(h) {
this.horizontal_ = h;
if (this.horizontal_) {
this.className = 'horizontal-drag-handle';
} else {
this.className = 'vertical-drag-handle';
}
},
get vertical() {
return !this.horizontal_;
},
set vertical(v) {
this.horizontal = !v;
},
forceMutationObserverFlush_() {
const records = this.observer_.takeRecords();
if (records.length) {
this.didTargetMutate_(records);
}
},
didTargetMutate_(e) {
const modeSize = this.targetSizesByModeKey_[this.modeKey_];
if (modeSize !== undefined) {
this.setTargetSize_(modeSize);
return;
}
// If we hadn't previously sized the target, then just remove any manual
// sizing that we applied.
this.target_.style[this.targetStyleKey_] = '';
},
get targetStyleKey_() {
return this.horizontal_ ? 'height' : 'width';
},
getTargetSize_() {
// Get the actual size, which may be different from the expected size
// because of size constraints (e.g. min-width) etc.
const size =
parseInt(window.getComputedStyle(this.target_)[this.targetStyleKey_]);
this.targetSizesByModeKey_[this.modeKey_] = size;
return size;
},
setTargetSize_(s) {
this.target_.style[this.targetStyleKey_] = s + 'px';
this.targetSizesByModeKey_[this.modeKey_] = this.getTargetSize_();
tr.b.dispatchSimpleEvent(this, 'drag-handle-resize', true, false);
},
applyDelta_(delta) {
// Apply new size to the target.
if (this.target_ === this.nextElementSibling) {
this.currentDraggingSize_ += delta;
} else {
this.currentDraggingSize_ -= delta;
}
this.setTargetSize_(this.currentDraggingSize_);
},
onMouseMove_(e) {
// Compute the difference in height position.
const curMousePos = this.horizontal_ ? e.clientY : e.clientX;
const delta = this.lastMousePos_ - curMousePos;
this.applyDelta_(delta);
this.lastMousePos_ = curMousePos;
e.preventDefault();
return true;
},
onMouseDown_(e) {
if (!this.target_) return;
this.forceMutationObserverFlush_();
// Start with the current actual size.
this.currentDraggingSize_ = this.getTargetSize_();
this.lastMousePos_ = this.horizontal_ ? e.clientY : e.clientX;
document.addEventListener('mousemove', this.onMouseMove_);
document.addEventListener('mouseup', this.onMouseUp_);
e.preventDefault();
return true;
},
onMouseUp_(e) {
document.removeEventListener('mousemove', this.onMouseMove_);
document.removeEventListener('mouseup', this.onMouseUp_);
e.preventDefault();
this.currentDraggingSize_ = undefined;
}
});
</script>
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